Improvement in nailers for lasting boots and shoes



a. McKAY."

NaiIers for Lasting Boots and Shoes.

N0. 134,083. v Patented Dec. 17, 1872.

I M I AM PHOTO-LITHOGRAPHICCQNX(0SBOI7N53 PRUCESS.)

UNITED STATES PATENT DrFIcE.

GORDON MCKAY, OF CAMBRIDGE, MASSACHUSETTS.

Specification forming part of Letters Patent No. 134,083, dated December17, 18:72.

To all whom it may concern:

Be it known that I, GORDON MGKAY, of Cambridge, in the county ofMiddlesex and State of Massachusetts, have invented an Improvement inNailers for Boot and Shoe Last ing, &c.; and I do hereby declare thatthe following, taken in connection with the drawing which accompaniesand forms part of this specification, is a description of my inventionsufficient to enable those skilled in the art to practice it.

The inventionrelates to the construction of a tool designed particularlyfor use in lasting boots and shoes, for driving lasting nails or tacks,the purpose of the invention being to provide a tool containing initself the power to drive the nails, or to operate the driver, the toolhaving-simply to be moved from place to place and the power brought intorequisition by the hand of the operator, and preferably bythe same handthat moves the tool. My invention consists primarily in a mailer ornaildriving tool, having provision in itself for operating thenail-driver.

Incarrying out the invention I prefer to use p a tool having acompressed-air chamber or reservoir and a valve through which connectionmay be alternately made and cut off between the reservoir and apiston-chamber, air

being let into the piston-chamber from the reservoir to drive thepiston, and communication being then cut off between the reservoir andpiston-chamber, and opened between the piston-chamber and theatmosphere, the piston being then thrown up by a spring. The combinationof the compressed-air reservoir, pistonchamber, piston, spring, andslide-valve constitutes a part of my invention.

. The drawing represents a sectional view of a tool or mechanismembodying my invention.

a denotes a res ervoir for receivin g compressed 'air, this reservoirhaving preferably an inlettube, b, controlled by a valve, 0, which valveis forced down as the compressed air strikes it to enter the cylinder,the valve having its seat and permitting the air to pass by it into thereservoir and closing by the action of a spring, d, or by the backpressure of the compressed air within the reservoir when the chargingsupply is cut off. 6 denotes a pistoncylinder having a fixed connectionwith the main cylinder a. At the bottom of the cylin der a is a plate,f, between which and a seatplate, 9, is a slide-valve, w. The valve 00has a pocket or passage, 6, extending through it, and with this pocket apassage, 70, in the plate f communicates, when the valve is in itsnormal position, as seen in the drawing, the valve being held in thisposition by the stress of a spring, I. \Vhen the valve is slid forwardfrom this position the pocket '6 passes under the plate f (shutting ofi'communication between it and the chamber a) and over a tube or passage,m, which leads into the pistonchamber a. This chamber contains a piston,0, (whose head 10 fits and slides in the chamber,) having at its lowerend the driver q, the

piston being forced up by the stress of a suitable spring, 1", and downby the entrance of compressed air from the pocket t into the pis tonchamber above the piston. When the slide-valve is thrown back by itsspring (after having been pressed forward) the tube or passage m isbrought into connection with an exhaust-port, 8, through which and anoutletpassage, t, the compressed air escapes from the piston-chamber,after having operated to forcethe piston down and to actuate the driver.The slide-valve may be thrown forward by a bar, it, pivoted at a, thisbar being preferably so constructed and arranged that the operator, ingrasping the cylinder 0, readily embraces also the bar If.

The operation of the mechanism is as follows: The air reservoir or tanka being charged with compressed air by a suitable air-compresser engine,the tool is held over and against the material to be nailed with thenail-plate 3 against the surface where the nail is to'enter,

a nail or strip of suitable nail-forming material being in the nail-tubeq, a nail-forming material being preferably used, and preferably in theform of a strip T-shaped in section, the end of said strip entering thenail-tube through a-lateral guide-passage made of correspondingT-sha-pe, as seen at B, which shows an end view of the nail-plate y, tolet the strip through it, the driver, as it descends, not only drivingthe nail, but cutting it from the strip by the same blow by which thenail is driven. Having the tool held in place, the parts being in normalposition, as seen in the drawing, and the pocket t charged withcompressed air from the reservoir a, the operator, grasping the cylindere and bar 25, presses the bar in, thereby moving the slide-valve,cutting off communication between the pocket and the reservoir 11, andbringing the pocket into communication with the tube or passage m, thecompressed air expanding and driving down the piston and nail-driver,thereby severing and driving the nail. Pressure upon the bar to beingthen withdrawn, the slide-valve is thrown back by the spring l, the tubem is brought into connection with the exhaust s, and the piston anddriver are then driven up by the spring r, the air above the piston-headescaping through the exhaust, the movement of the slide-valve againbringing the pocket 6 into connection with the passage 7a leading intothe reservoir or tank.

by this means, without any power connection, and without any exertion offorce by the operator other than to push thevalve forward, the nails areautomatically driven, or cut and driven, the instrument being moved fromplace to place for insertion of the several nails, or the work beingmoved under the tool and the tool held stationary.

Other power than the compressed air may be used, but I prefer the air asa driver.

I claim- The combination of the air-cylinder a, piston cylinder 0, andthe valve and driving mechanism, arranged to operate substantially asshown and described.

GORDON MGKAY.

Witnesses:

FRANCIS GOULD, M. W. FROTHINGHAM.

